Pen



FIG. 1 is a front perspective view of the invention.

FIG. 2 is a front elevation view of FIG. 1, elevated.

FIG. 3 is a rear elevation view of FIG. 1.

FIG. 4 is a left side elevation view of FIG. 1.

FIG. 5 is a right side elevation view of FIG. 1

FIG. 6 is a top plan view of FIG. 1; and,

FIG. 7 is a bottom plan view of FIG. 1.

The broken lines in FIGS. 1-6 are included to show portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 